Malicious PDF — malware analysis report

Static analysis result for SHA-256 18000873af9c6feb…

MALICIOUS

PDF

113.7 KB Created: 2021-06-28 04:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ef24e56223ab4ec576d7ff681aa9091 SHA-1: 120e7c73bfb7fc393786701fac857ffbe6f1e5e4 SHA-256: 18000873af9c6feb876b3e3e8c3a67cb0575675016c30bce9442b12e74bc68e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. While no scripts were explicitly extracted, the PDF structure and link farm nature suggest an attempt to lure users to malicious sites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://alcoquimicos.com/ckfinder/userfiles/files/98298986977.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16076a12c01545---15954043683.pdf
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/vidunakapot.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/ab42e70fe643bc518d4094c0f5ca6a2a/durojogabesuwupojeva.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/417dc3fad24146898ac0f78bf8fcb850/39815466269.pdf
    • http://bpsstudio.hu/uploads/safilewokapejid.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baa0e0966f8---75335160288.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/1d2dd2232169670849ab7268b043e6da/62176714382.pdf
    • http://dhf-china.com/d/files/3847282646.pdf
    • http://auchli-appenzeller.ch/userfiles/files/koxomegusuzidanasugu.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/4a2cede4c470a68caa50cf8355b5658d/59748433343.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f38e37473---sotokevoz.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072dc0d9a84b---81478309485.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/9f6a539abb69d5caccf671d795761b88/lupiwaxarobapedu.pdf
    • http://conomiya.com/images/uploadedimages/file/13226717216.pdf
    • http://antae.be/app/webroot/uploads/file/poxedetuxikivedi.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c5a6f1d58---59147218241.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/9kvave12pd35297sifv26bo3ok/xugikezijikebarotumazax.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9532114bd---30555645012.pdf
    • http://stellar.ru/ckfinder/userfiles/files/sujodojopoxukaropegex.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ec5a151f2---44901982632.pdf
    • https://vinniescustoms.com/userfiles/files/323857960.pdf
    • http://cdhsalumni.com/clients/28864/File/nilenav.pdf
    • http://a-kamen.com/userfiles/file/15797883645.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/09mtcpn3flodtljfkc5tljkn02/vagekimibalid.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=digital+electronics+book+for+gate+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001583d.bin
724b4153d7e9761bc4e466855a8b74033496143ee804ded20d79e301be63ec69
pdf-font-stream PDF embedded font (sfnt) at offset 0x1583D 18076 bytes
font_01_sfnt_off000187d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x187D9 16792 bytes
font_02_sfnt_off00019ff0.bin
d04a3d3fed8a57385a6fa08cafebc74e44ec88cb724508d6858adfc182e6d854
pdf-font-stream PDF embedded font (sfnt) at offset 0x19FF0 11028 bytes